Add initial Request Blocklist feature configuration

Add an initial configuration for the new Request Blocklist feature. Include a
couple of testing rules, for the privacy test page[1]. Also include a
corresponding Tracker Allowlist rule for the test page as well.

1 - https://privacy-test-pages.site/privacy-protections/request-blocklist/

Author: kzar

features/request-blocklist.json

@@ -0,0 +1,37 @@
+{
+    "_meta": {
+        "description": "Request blocking rules necessary to fix website breakage. Note: Tracker request blocking is handled elsewhere.",
+        "sampleExcludeRecords": {
+            "domain": "example.com",
+            "reason": "site breakage"
+        }
+    },
+    "state": "enabled",
+    "settings": {
+        "blockedRequests": {
+            "privacy-test-pages.site": {
+                "rules": [
+                    {
+                        "rule": "privacy-test-pages.site/privacy-protections/request-blocklist/*?block=true",
+                        "domains": [
+                            "privacy-test-pages.site"
+                        ],
+                        "reason": "Testing rule for the privacy test page, see https://privacy-test-pages.site/privacy-protections/request-blocklist/"
+                    }
+                ]
+            },
+            "third-party.site": {
+                "rules": [
+                    {
+                        "rule": "third-party.site/privacy-protections/request-blocklist/*?block=true",
+                        "domains": [
+                            "privacy-test-pages.site"
+                        ],
+                        "reason": "Testing rule for the privacy test page, see https://privacy-test-pages.site/privacy-protections/request-blocklist/"
+                    }
+                ]
+            }
+        }
+    },
+    "exceptions": []
+}

features/tracker-allowlist.json

@@ -9,6 +9,17 @@
     "state": "enabled",
     "settings": {
         "allowlistedTrackers": {
+            "third-party.site": {
+                "rules": [
+                    {
+                        "rule": "allowlisted.third-party.site",
+                        "domains": [
+                            "privacy-test-pages.site"
+                        ],
+                        "reason": "Testing rule for the privacy test pages"
+                    }
+                ]
+            },
             "2mdn.net": {
                 "rules": [
                     {

schema/config.ts

@@ -21,6 +21,7 @@ import { CustomUserAgentFeature } from './features/custom-user-agent';
 import { BurnFeature } from './features/burn';
 import { Taskbar } from './features/taskbar';
 import { AppHealth } from './features/appHealth';
+import { RequestBlocklistFeature } from './features/request-blocklist';
 
 export { WebCompatSettings } from './features/webcompat';
 export { DuckPlayerSettings } from './features/duckplayer';
@@ -65,6 +66,7 @@ export type ConfigV5<VersionType> = {
         scriptlets?: ScriptletsFeature<VersionType>;
         windowsWebviewFailures?: WindowsWebViewFailures<VersionType>;
         customUserAgent?: CustomUserAgentFeature<VersionType>;
+        requestBlocklist?: RequestBlocklistFeature<VersionType>;
     };
     unprotectedTemporary: SiteException[];
 };

schema/features/request-blocklist.ts

@@ -0,0 +1,17 @@
+import { Feature } from '../feature';
+
+type RuleType = {
+    rule: string;
+    domains: string[];
+    reason: string[] | string;
+};
+
+type SettingsType = {
+    blockedRequests: {
+        [domain: string]: {
+            rules: RuleType[];
+        };
+    };
+};
+
+export type RequestBlocklistFeature<VersionType> = Feature<SettingsType, VersionType>;